Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7faba3d6166f3c…

MALICIOUS

PDF

104.1 KB Created: 2021-08-17 19:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ce9cc1c3d0d56ebeee8ba1aff611c55b SHA-1: 6671ffdff7e9402cd788840f48109fb081d5d4cd SHA-256: 9b7faba3d6166f3cfd9bbc6639c7fb18edd7ec79063b7b6e30148b9f12fd87d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to direct users to potentially malicious content. The presence of multiple disposable hosting links further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16098c19396dee---50753511568.pdf In PDF document text
    • https://satybharat.com/ci/userfiles/files/kokiki.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16088ae093f955---laputebavetaxuruvab.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/b07a62c7f034c3d2f5cbe22f511c9299/tigegozanawavenis.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608150e873077---rupekopukisoruvurenegi.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/7337508452.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/18643417993.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/3501322d565ccced03c3ea1495edeef0/janojofemobu.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4jem25kacvhvv1j3970kghfvim/42640964182.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/fa3bari7lr4m1o89odhc8bak6e/zenuno.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/redajir.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a26298e9a8a---zifugeleruragit.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607848df055e1---netorovufob.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/f2qscl2qhrdk12nito7rd8ool5/25080590160.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/limabawo.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afe53c23e42---48670156442.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e4eeccf98---37651393101.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/964d7a9f23b5e9583459befe76396228/98548489757.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/49471144537.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/selokezitufitutuwimifeva.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/kurexizubu.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/99884619632.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/5480452067.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=aplicaciones+de+las+funciones+trigonom%C3%A9tricas+en+la+vida+cotidiana+ejemplosPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EC 11396 bytes
SHA-256: 9d637eb6692ae0800039c214bad64df3d6354a84cf08f2f0ee261cde5a26c59a
font_01_sfnt_off00013f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15768 21236 bytes
SHA-256: f4290b13cbfec0b5281fc1a0db01fab7a3be2a5bda2d91b482ab4817ce4094ba

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